[Foghorn]

I have a Keith Craft 482FE in my car. The jets are as delivered, but I have changed the idle bleed, high speed bleed, and idle feed restrictors. My current settings are:

Main Jets: 69
Secondary Jets: 77
Power Valve: 6.5
Power Valve Orfices: 65 (? - I need a magnifying glass to read 'em!)
Idle Air Bleed: 67
Hi Speed Bleed: 35
Idle Feed Restrictor: 37
Idle Screws: out one turn

The timing curve is good.

My Innovate LM2 says the A/F ratio is 14.1 at idle, 13.5 cruising at 2k RPM, 14.1 cruising at 3k, 12.5 WOT.

The problem is that the plugs and sidepipes tell me that I am waaay rich (pipes are black/sooty/almost oily). Also, I when driving "spirited" the engine pulls really good, and then at 4200 RPM or so, it jumps like an old two-stroke coming up on the pipe. Almost to the point of being undrivable.

TK tells me that I have a sudden rich condition at 4200, which makes sense, except that the meter tells me I'm good and the plugs/pipes tell me I'm rich. I've thought about smaller primary jets and a higher # power valve.

Any suggestions would be appreciated.